Website Autofill program

Need an autofill program made. A website I use requires a Firstname, an email address, same email address a second time, a java box checked, and a 13 digit number filled in. It then emails a link to the email supplied. I need a autofill program to fill in this website automatically. It will use .txt files to pull the info from, and will add info to. So it may have a txt file for first names, email address's, and a 3rd one for the 13 digit numbers. Basically the website tracks email address's and 13 digit numbers, so the .txt files would hopefully prevent us from using the same email/13 digit number more then once. Like the program would maintain a txt database to check new email/13 digit numbers against, and remove the duplicates before it submitted them to the website. I don't know how many entries will be required to guarantee the return email. I don't know which 13 digit numbers have been used before, but the website does. Therefore I am guessing it might take perhaps 200-500 tries to generate 50-100 return emails? I don't believe I'd be submitting more then 500 13 digit numbers per day. I'm guessing its java, but I don't really know, but the box that needs to be checked is "Extracare". Checking that box opens a small field where the 13 digit number goes in. Once you click submit, it takes the site a few seconds and it either says thank you for joining, an email is sent to you, or it errors out, saying that email address has been used or they have no record of that 13 digit number. Website URL to check your program against is in the attached .zip file. Looking to have this made quickly, thanks for looking/bidding.